Nashbar AT1 Mountain Bike. The Nashbar AT 1 has you trail ready at a cost that won't send you packing. The AT 1 mountain bike sports goodies like a 6061 aluminum frame with a 50mm travel suspension fork that smooths rough terrain and gives you amazing control. Shimano components and a 21 speed drivetrain give the right gearing to get you up and down any terrain without wasting valuable energy. And with a super comfy saddle, the AT 1 is ready for a weekend on the trails or your favorite greenway!